Improvement in feed-motions for drilling and boring machines



c. SELLERS.

FEED-Menon Fon DRILLINQAND BomNG MACHINES. 10.174.014. .Patented Feb. 221 187s.

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COLEMAN SELLERS, OF PHILADELPHIA, PENNSYLVANIA.

lIMPROVEMENT IN FEED-MOTIONS FOR DRILiLlNG iiND BORING MACHINES.

. Specification forming part of Letters Patent No. 174,014, dated February 22, 1876 application filed January 27, 1876.

To all whom t may concern Be it known that l, COLEMAN SELLERS, of the city andl county of Philadelphia and State of Pennsylvania, have invented a new and useful Feed-Motion for Drilling and Boring Machines; and l do hereby declare the following to be a fulland exact description thereof, reference being made to the 'accompanying drawing, forming part of this specification.

My present improvement relates to that class of feed-motions where au epicyclic or sun-and-planet train of gears is used to transmit the feed-motion from the drivingpower to the cutting-tool. An arrangement of this kind is shown and described in Letters Patent of the United States, dated March l, 1864, granted to-Wm. Sellers &; Go., where a slow powerfeed and .quick hand-feed are obtained from the same Vset of wheels constantly in gear, the change from one feed to the other being made by clamping .or releasing the feed-shaft n by means of the clamping-screw o, as shown in the accompanying drawing.

The object of my present improvement is to provide, in addition to the'above feeds, a quick power-feed, which can be thrown into and out of gear without interfering with the working of the other parts.

The accompanying drawing shows asec-` tional side elevation of a machine embodying my improvement, in whichl s s is a cone-pulley, driven from the cone t t,

4 and having the pinion r on its hub, driving the wheels zand w. w is fastened on the shaft ac, having the pinion y driving the wheel A, secured to the hub of the sun-pinion g, which is the central pinion of the epicyclic train, and p p are the planet-wheels carried by the plate M, which is secured to the feed-shaft a. The wheel z turns freely on the feed-shaft n, and has on the end of its hub a screw-thread engaging with a. corresponding screw-thread in the nut B, which also turns treely on the feedshaft n. The collar D is secured firmly to the feed-shaft u. By means of the nut B the wheel z and the collar D can be clamped firmly together, and so drive the shaft n 'by the wheel z.

The operation of the machine is as follows: 1f the screw c and nut B are both unscrewed, the feed-shaft n will revolve slowly, and will impart no feed to the drilling or boring spindle d. If the shaft n be retarded in its motion, as by friction on the hand-wheel u, or

'c being released,) the shaft n will be made to revolve, and with it the planet-wheels pp, in a direction contrary to that. which would be produced by the epicyclic train when the clamp-screw c is released, and a new feed will be produced, which will be in addition to that given by the sun-wheel alone of the epicyclic train, so that the feed given to the cuttingtool will be the'sum of the two feeds.

As the variation of speed of the drivingpinion T, obtained by the shifting the belt on the cone-pulleys s s and t t, affects both feeds, itis evident that a great range can be obtained.

This feed is especially adapted for finishing cuts in boring, as the holes produced by a wide feed or a quick traverse through the work are much more uniform in size, and the cutters last much longer without sensible wear, than is the case when a fine feed is used for that purpose.

The advantage of coarse feeds for nishiug has ulong been recognized, and to some extent used, but I am not aware that any special device has been employed to accomplish it.

The timerequired to change ordinary gearing, as well as the limit of feed in cone-pulleys, or the like, has hitherto prevented the use of such finishing feeds, except in large work or on long cuts, and the special merit of my present invention is that it not only provides such quick feedwith certainty, but also without loss of time.

, Having now described my invention,| what I claim as new, and desire to secure by Letters Patent, is-

In drilling or boring machines, an epicyclic train when both the sun and planet wheels are gea-red tothe drilling or boring spindle, substantially as and for the purposes set forth.

COLEMAN SELLERS.

Witnesses COLEMAN SELLERS, Jr., HARVEY G. STEWART.r 

